Build Log | RE SX | Problem | 1st build (pics)

ok so this is my first time attempting to build a sub enclosure. This is for my 1995 Jeep YJ Wrangler (stock elec.) With this Im using a 12" RE SX along with a Cadence TXA-1000D(1000@1ohm) amp. Seeing its my firs build something was meant to go wrong. For my 2nd mdf port plate i cannot screw it together with the 1st port plate. I worked outside to in when i should have worked inside to out.
My options are:
1.Rip out side plate and screw in port plate, reattach side plate
2.find device capable of attaching drill bit and fitting in 4 inch space(workaround)
3.dont do anything, glue it together and use some silicone
4.suggestions from you
The box is tuned close to 33hz and is 2.197c^3. anyway heres the pics so u can see what Im talking about.
Still not finished. check last 2 pics for my problem.